Ironweed (Vernonia noveboracensis) is in our garden. The image provided by Alex matches a copyrighted photo by mgnv.org, so it has been replaced.
Vernonia noveboracensus is known as New York Ironweed, a perennial native to the eastern United States. It features magenta flower clusters on stalks that can reach up to 8 feet tall. It attracts bees and butterflies. It was the Virginia Native Plant Society's Wildflower of the year in 1995. It is common in Virginia.
When ours blooms, we will replace the photos!